Sizing tool



Dec. 4, 1923.

G. W. BENEDICT SIZING TOOL Filed May 11 1922 26 IN View TOR GEO/2' h. BENEDICT Patented Dec. 4, 1923 GEORGE W. BENEDICT, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MID-WEST MANU- FAFJTURING COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF SOUTH DAKOTA.

SIZING TOCL.

To all whom it may concern:

Be it known that T, GEORGE W. BENEDICT, a citizen of the United States, resident of Minneapolis, county of Hennepin, and State a of Minnesota, have invented certain new and useful Improvements in Sizing Tools, of which the following is a specification.

This invention relates to improvements in sizing tools and particularly to such tools employed in finishing or burnishing the in-- terior of cylinders. By means of this improved tool, new cylinders in process of manufacture may be finished, or rebored cylinders may be finished and stock pistons fitted to slightly worn cylinders without.

necessity of removal of the c 'linder from its mounting. More specifical y this present invention involves improvements upon the sizin tool set forth in applicants present pending application, Serial Number 523,239,

filed December 17, 1921, Among such additional improvements may be noted the novel receptacle for the sizin compound and the means for delivering the compound to the leading edges of the bars, the grooved outlet for the compound and the means for returning the compound to the receptacle for further use.

The object therefore of this invention is to provide an improved sizing tool.-

Other objects of the invention will more fully appear from the following description and 'will be pointed out in the annexed claims. 1

In the drawings there has been disclosed a structure designed to carry out the objects of the invention, but it is tobe understood that the invention is not confined tothe exact features shown as various changes may bemadeiwithin the scope of the claims which follow.

In the drawings:

Figure 1 is a vertical sectional view through the tool and also showing a portion of a cylinder in section;

Figure 2is a view inside elevation of a portion of the tool to show the receptacle, grooved outlets in the bars, and means for returningthe delivered compound;

Figure 3 is a cross-sectional view on the line 3-3 of Figure 1; u

Figure 4 is a detailed cross-sectional view of the collar providing the movable springmounting; and

Figure 5 is a cross-sectional view on the line 5-5 of Figure 4. Y

In the selected embodiment of the invention here shown for purposes of disclosure, there is illustrated a portion of a cylinder wall withthe tool disposed thereabove in position for insertion within the cylinder. The tool comprises a shaft 7 upon the lower portlon of which is carried a sleeve 8 held in position thereon by means of the pins 9. The lower terminal portion of this sleeve is shaped to provide a block 11 which is frustocon1cal in form. This sleeve is preferably provided with hexagonal peripheral surfaces12 and integral webs 13 which proect radially outwardly from the .middle portlon of each surface 12. These web's 13 extend longitudinally of these sleeve surfaces. v

The finishing or burnishing surface of this tool is preferably sectional and is provided by a (plurality of bars 14.. These bars corre spon in number to the webs 13, and are here shown as six in number although, obviously, a smaller or greater number may be employed with consequent change in number of the sleeve surfaces 12 and their projecting vWebs 13. These bars are-similar and butv one need be described. The bar 14 is'provided with a longitudinally extendin recess 15 which is inwardly presented an may. receive a web 13. The outer surface 16 is curved substantially to form an arc of a circle whose center is in the longitudinal axis of the shaft 7. The bar is mounted upon the web relatively loosely and with freedom for longitudinal and radial croutward movements so that the unitary group or series of bars of a tool may provide a pluralityof surfaces 16 conforming to the curvature of theinner face of the cylinder which is to be sized or finished. Preferably, the web-receivin recess 15 of each bar is provided by inwar ly'extending opposed bladesl'? with transverse reinforcing webs 18. The lower end portions 19 of the bars are inwardlyand upwardly curved or ,beveledfor contact with the corresponding cam surface of the block 11. The effect of such cam engement isto force each of the tion of the tool for removal.

bars are inwardly and downwardly curved or beveled for contact with the similar cam surface of the frusto-conical block 22 in vertedly mounted upon the shaft 7, so that it may have sliding movements thereon. This block 22 is normally under the downwardly exerted tension of the spring 23 coiled about the shaft 7 and the integral hub of the block 22. The upper end of the spring 23 is held against the lower "face of the nut 24 received in threaded engagement on the upper threaded portion of the shaft '1. The block 22 is thus normally and yieldably depressed to engage the bars 14, both to thrust each. outwardly and to depress all against the lower block 11, uniformly to hold the bars in outwardly extended working position. Means are provided whereby the operator may pull the block 22 out of engagement with the bars and allow contrac- Such means are conveniently adorded by wire loop 25 having its lower end portions inserted through diametrically opposed apertures in the upper block 11 and inwardly terminally odset to grip the block. The loop upwardly projects in convenient position for the operation.

A novel support for each of the bars is provided which support yieidingly resists outward movement of each bar Such sup port in the form here shown, consists of spring wires 26, each having a terminally offset-end seated in an aperture 27 in one of the blades 17 of each of the bars 1d. The remainder of each wire is then upwardly looped and downwardly extended and till coiled about itself and thence upwardl extended and secured to a collar 29 sli abl mounted upon the shaft. The preferred form of collar is shown in detail in Figures 4 and 5. v The outer peripheral surface of the collar is hexagonal in form and has an annular groove 31 cut therein. The ofilset ends 32 of the wires 26 are inserted within the groove. A metallic sleeve 33, which is cylindrical in form, is placed about the collar alter emplacement of the wires and the upper and lower. edges of the sleeve are preferably inwardly rolled to hold the wire ends in place. The collar and springs nor mally tend to hold the bars in the retracted position shown in Figure l but are yieldahle to permit outward projection of the hare upon engagement of the upper block and bars. Thus, when the tool is about to he inserted into a cylinder, the loop 25 is upwardly pulled so that the bars 14 are free froni'the upper block 22 whereby spring wires 26 tensionahly move the bars to retracted or compact position. Upon insertion, the loop is released and. the loloclr 22 is tensionably forced downwardly by the coil spring 23 and the upper and lower ends of the bars ill will he engaged lay the care curl of arness the blocks 11 and 22'so that the bars are all equally outwardly extended and their hearing surfaces will engage, and upon rotation, ride upon the walls of the cylinders This novel bar mounting functions to maintain the bars in arcuate alinement with the surface to be sized or finished while the tool is being rotated. The blades 17 or" each bar are free to move upon the cam surface of either or both blocks and the bars will be alined, for example, on a high spot in the cylinder,. and a straight bore will be produced and such high spots removed.

In this improved form of sizing "tool the receptacle for a sizing compound is carried by the bar, or, as shown, each bar is simiill) larly formed to provide such a receptacle.

The bars are also formed both to deliver the compound from the receptacle to the leading edge of the bar and to return the cornpound to, a receptacle. As the bars are similar in this respect, it will be necessary to describe but one. As shown in the drawings, the upper end portion of each bar it is hollowed out or recessed to provide a receptacle 34: which is adapted to be filled with a sizing compound 35 preferably in a fluid state. A delivery duct 36 leads from each receptacle 34% to a longitudinally extendin groove 3? lorined in the outer surface '0 the bar. Each groove is preferably positioned adjacent the leading edge of its bar. Thus the compound may pass by gravity down its duct 36 and he delivered to the communica'tin groove 37 from which the sizing compound is discharged directly upon the wall or" the cylinder as well as the peripheral surfaces or the bars when the bar is rotated during operation.

Means are provided to eidect the return or the compound to the receptacle in order substantially to maintain a continuous flow of compound from the receptacle to the cylinder wall and return. A simple means of edecting this result is provided by upwardl and rearwardly inclining the leading e go off each her as is hown in Figures 2 and 3. This is efiected hy means of an angled beveled upwardly enlarged recess 38 along the leading edge of each bar. Thus, the compound is scraped from the cylinder wall loy each leading edge and is delivered to its adjacent recess 38 whereby the compound is upwardly forced over the to of the her into the receptacle. To facilitate Y such delivery the top portion of each bar adjacent the leading edge is cutaway to provide a passage 39 leading from the longitudinal recess 38, to the receptacle There is illustrated in Figure l. a convenient means for rotating the shaft 7 of the toolfwhich comprises a novel universal jointforrninc the subject matter of copending opp icetion, filed h the inventor cereal as executed May 5, 192i." Further mmose more, it may be noted that the lower end of the shaft 7 is shown inFigures 1 and 2 as extending below the block 11. This shaft extension is employed as a bumper to contact with an object placed adjacent the lower end-of the'cylinder being sized or finished, for the purpose of preventing thelower ends of the bars 14 from contacting with anything which mi ht injure them during the operation of the tool. It may also be used as a bottom rest for the tool when placed in an upright position in a rack, etc., when not in use.

Having thus described my invention What I claim as new and desireto secure by Letters Patent,-is:

1. A sizing tool comprising a shaft, a plurality of sizing bars mounted thereon for radial movement, and means carried by a bar for delivering sizing compound adjacent the leading edge of the bar.

2. A sizmg tool including a supporting element, a plurality of sizing members mounted thereon for radial movement, and means carried by the tool for delivering sizing compound to the exterior of a sizing member.

3. A sizi-n tool comprising a shaft, a plurality of sizing bars mounted thereon for radial movement, a receptacle for sizing compound carried by a bar, and means for delivering the compound from said receptacle to the leadin portion of the bar.

4. A sizing too comprising a shaft, a plurality of sizing bars mounted thereon for radial movement, a receptacle for sizing compound carried at the upper end of each bar, and means for delivering the compound from; each receptacle to the leading edge portions of the bars. Y

5. A sizing tool comprising a shaft, a plurality of sizing bars mounted thereon for radial movement, a receptacle for sizing compound provided by an integral recess in the upper end portion of each bar, and means on each bar for delivering sizing compound from each receptacle to the leading edge portions of the bars.

6. A sizing tool comprising a shaft, a plurality of sizing bars mounted thereon each groove.

for radial movement, a groove longituolnally on the outer face of a bar,and means for delivering sizing compound to said groove.

7. A sizing tool comprising a shaft, a plurality of sizing bars mounted thereon for radial movement, grooves longitudinally extending on the outer face of each bar, and receptacles for sizing compound carried by each bar, and means affording communication between each receptacle and adjacent.

groove whereby compound is delivered to 8. A sizing tool comprising a shaft, a

plurality of sizing bars mounted thereon for radial movement, a receptacle for sizing compound carried adjacent the upper end portion of a bar, means for delivering the compound adjacent the leading edge of said bar, and the upwardly and rearwardly inclined whereby, upon rotation of the tool in a cylinder, the delivered compound may be returned to the receptacle for re-deliveryQ Y 9. A sizing tool comprising a shaft, a plurality, of sizing bars mounted thereon for radial movement, receptacles for sizing compound provided by integral recesses in the upper end portions of the bars, means on each bar for delivering sizlng compound from itsreoeptacle to the leading edge porreturn the delivered compound to said delivery means.

In witness whereof I have hereunto set 111 hand this 5th day of May 1922.

GEORGE w. BENEDICT.

eading edge of said bar being ill) 

